Statements: All hens are cocks. No cock is black. Conclusions: I. All cocks are hens. II. No hen is black.

Only conclusion I is valid
Only conclusion II is valid
Both the conclusions are valid
Both the conclusions are invalid

Correct Answer: Only conclusion II is valid

Explanation:

All hens are cocks. (A) ↔ No cock is black. (E)
A + E → E- type of conclusion "No hen is black."
This is Conclusion II.

More Questions from Syllogism

Statements: Dogs have four legs. Tables have four legs. Conclusions I. Tables are dogs. II. Dogs are tables.
Statements: (a) All English movies are violent. (b) Some people like watching English movies. Conclusions: I. All people watching English movies like violence. II. All people who like violence watch English movies.
Statements: (a) All cupboards are watches. (b) All watches are costly. Inferences: I. All cupboards are costly. II. Some costly things are cupboards.
Statements: All fruits are sweet. All sweet things are not good for health. Conclusions: (I) All fruits are not good for health. (II) Some fruits are not good for health.
Statements: (a) All pens are papers. (b) No eraser is a paper. Conclusions: I. No eraser is a pen. II. Some papers are pens.
Statements: (a) No girl is a parrot. (b) Sowmya is a girl. Conclusions: I. Sowmya is not a parrot. II. All girls are not Sowmya.
Statements: (a) All children are students. (b) All students are players. Conclusions: I. All cricketers are students. II. All children are players.
Statements: a. All metals are silver. b. All silver are diamond. c. Some diamonds are gold. d. Some gold are marbles. Conclusions: I. Some gold are metals. II. All metals are diamond. III. Some silver are marble. IV. Some gold are silver.
Statements: I. Some cats are dogs. II. No dog is a toy. Conclusions: I. Some dogs are cats. II. Some toys are cats. III. Some cats are not toys. IV: All toys are cats.
Statements: Some scales are pencils. Some erasers are pencils. Conclusions: I. Some pencils are erasers. II. Some pencils are scales.

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